So many good suggestions here and I'll add that sometimes I travel by myself. One poster mentioned practicing with red solo cups which is a good way to practice.
I bought 6 bright-red 24" tall cones at Lowe's to use when I'm traveling alone. They work like a charm for me.
I place them in the general area where I DON'T want to go. I will put a couple at the rear as I can see them perfectly in the camera showing where I need to stop.
Once, traveling through Florida heading back to TN, my navigation sent me down a narrow country road on a way to a campground that I was looking for! I found a fairly wide driveway that I felt where I had enough room to turn around (back into). The entrance to the driveway had a pole fence on both sides that narrowed as you went into the driveway.
I pulled out my cones and put them where the fence started to narrow on either side. Of course I had to disconnect my toad. I did get out every 5 ft. to recheck my tracking as I started my backing procedure. All was good.
As I was trying to back into the driveway, I had to be very careful as the front driver's corner was getting very close to the fence across the street from the driveway. I felt like I was trying to thread a needle!!!
Anyway, I made it without a scratch and those red cones were a lifesaver for me.
Good luck!
Mark